Pipe or bolt threading machine.



.No. 722,032. PATENTED MAR. 3, 1903.

- F. MUBNGBR.

PIPE 0R BOLT THREADING MACHINE. APPLICATION FILED arm-1x4, 1002.

H0 MODEL.

WITNESSES JNVENTOR I g wi Allorneyk- 5 irnn STATES lFFlCE.

FREDERICK MUENGER, OF HILL CITY, SOUTH DAKOTA, ASSIGNOR. OF ONE- HALF TO O. VON WOEHRMANN, OF HILL CITY, SOUTH DAKOTA.

PlPE OR BOLT THREADING MACHINE.

sPECIFICATION forming part of Letters Patent No. 722,032, dated March 3, 1903.

Application filed September 4,1902. Seri l N 122,124. (No model.)

To aZZ whom, it may concern:

Be it known that 1, FREDERICK MUENGER, of Hill City, in the county of Pennington and State of South Dakota, have invented certain new and useful Improvements in Pipe or Bolt Threading Machines; and'I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is an improved pipe and bolt threading machine; and its object is to provide a simple machine by which pipes, bolts, rods, 850., can be readily threaded or rethreaded in situthat is, without removing them from their positions-whereverit is possible to slip the machine thereon, the machine itself being annular in form and provided with ratchet devices for rotating the threading-dies.

Another object is to provide the machine with interchangeable dies, so that pipes and bolts of different diameters can be threaded thereby.

The essential features and combinations embodied in the invention are stated in the claims appended to the following description of the machine illustrated in the accompanying drawings, in which Figure 1 is a side view of the complete machine in position to thread the end of a pipe. Fig. 2 is a longitudinal section therethrough on line 2 2, Fig. 1; Fig. 8, a transverse section on line 3 3, Fig. 1. Fig. 4 is a longitudinal section on line 4 4:, Fig. 3.

A designates a tube which is adapted to be slipped over the end of the pipe, bolt, or rod to be threaded and is secured thereto near the point where the threads are to be cut by means of the setting-bolts a, tapped radially thrkgough an enlarged collar on one end of the tn e. nally threaded, the threads being of a pitch similar to that of the threads to be cut by the machine, and on this threaded end is screwed a sleeve B, having a central peripheral projecting ratcheted flange b, which is adapted to be engaged by either the right or left hand tooth of an adjustable spring-pressed dog 0, which is pivotally mounted in a slot 61 in the handle-bar D, which is connected with an an- The other end of the tube is eXter-' nular casing E, surrounding the sleeve B, said casing having an internal flange E at one end fitting snugly against the outer end of the sleeve, while its other end is externally screw-threaded, as at e. The casing also has a slot 6' at the side next the handle for the entrance of the teeth of dog O, as shown. The dog 0 is pivoted on a pin cand is controlled by a spring 0, concealed in the handle, as indicated in the drawings,this particular feature not being novel per se.

Fitted within the casing and closely against the inner face of sleeve B is a screw-threading die F, cylindrical in form and having sego5 mental threading-teeth f of usual construction. This die,however,has on one end projecting lugs f, which are adapted to engage with corresponding recesses or sockets b in the opposed end of sleeve B, so as to lock the die to the sleeve and cause it to rotate therewith.

A ring B is also interposed between the sleeve and die to prevent any cuttings working into the ratchet-teeth. The die is removably confined in the casing by means of an end plate or cap G, provided with an internally-flanged collar G, adapted to engage the exteriorthreaded end 6 of the casing andclose the same, the cap being provided with a central aperture 9 for the passage of the pipe, bolt, or rod undergoing treatment.

In practice a set of interchangeable dies F should be provided with each machine, so as to enable it to be used in threading pipes, bolts, or rods of different diameters not exceeding that of tube A.

The operation is as follows: If the end of a pipe is to be threaded, a suitable die is placed in the casing. Then tube A is screwed into the sleeve. Then the tube, with the at- 0 tached die and casing, is slipped endwise upon the pipe and fixed and centered thereon at the proper point by means of the adjustable bolts a or other suitable devices. The dog 0 is then shifted so that the forcible os- 5 cillation of handle B will rotate the collar and die in the desired direction, and the operator simply oscillates the handle-lever until the work is accomplished. This oscillation of the casing imparts rotary motion to sleeve B in but one direction. Consequently as the cutting proceeds the sleeve is screwed on or backed off the tube A in exact proportion to the pitch of the threads being cut, insuring rapid and exact operation of the machine. When the threading operation is completed, the casing may be removed with the tube by loosening the bolts 00, or if it is necessary to back ofi the cutters the dog 0 is shifted so that the oscillations of handle impart a reverse rotation to the sleeve.

The machine is very compact, simple, and powerful and can be readily applied to pipes, bolts, &c., in situ. Its advantages will be appreciated by plumbers, gas-fitters, structural-iron workers, and others, and I do not Wish to restrict myself to the specific construction of parts as shown in the drawings.

Having thus described myinvention, What I therefore claim as new, and desire tosecure by Letters Patent thereon, is

1. In a pipe or bolt threading machine, the combination of an oscillating casing, a rotatable sleeve therein, and ahandle for operating the casing;'with means for rotating the sleeve by oscillating the casing, a removable die in the casing beside the sleeve and rotatable therewith, said sleeve and die having an interlocking tongue and groove, and a threaded cap screwed on the end of the easing for removably confining the die therein, substantially as described.

2. In a pipe or bolt threading machine, the combination of a tube, an internally-threaded sleeve screwed thereon and rotatable there upon, an oscillating casing inclosing said sleeve, and ratchet devices for rotating the sleeve by oscillating the casing; with a removable die in the casing beside the sleeve, said sleeve and die having an interlocking tongue and groove on their opposed faces whereby the die will be rotated with the sleeve, substantially as described.

3. In a pipe or bolt threading machine, the combination of a tube adapted to be secured upon the pipe or bolt, and externally threaded at one end; a rotatable internally-threaded sleeve engaging the threaded end of the tube, a casing inclosing said sleeve and rotatable on the tube, and a pawl and ratchet for rotating said sleeve by oscillating the casing,

said pawl and ratchet being inclosed in the casing; with a removable thread-cutting die in the casing interlocked with and rotatable with the sleeve, and a threaded cap screwed onto the end of the casing and confining the die therein substantially as and for the purpose described.

In testimony that I claim the foregoing as my own I afiix my signature in presence of two witnesses.

FREDERICK MUEN GER.

Witnesses:

EDWARD MILLISACK, THos. L. ScRUToN. 

